RTOS/CC2650: Sensor controller UART interface emulator

Hello Jinlong,

You will have to use 7 bits +1 parity bit to form a unsigned char that you send with the standard framework.

https://en.wikipedia.org/wiki/Parity_bit

Here is an idea I made on the fly on how to add an even parity bit. I have not tested this and I have not considered UART transmission endianess (LSB/MSB), I leave that for you to figure out.

const unsigned char oneBits[] = {0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4};

unsigned char appendEvenParity(unsigned char x) {   
    unsigned char nuOfOnes;
    unsigned char result;

    // Count ones in 7-bit data (remove MSb)
    nuOfOnes = oneBits[x&0x0f];
    nuOfOnes += oneBits[((x>>4)&0x07)];
    
    // left-shift the 7 Least significant bits and add 0 parity bit.
    result = x << 1;
    
    if(nuOfOnes%2) {
        // add parity bit (1) as there are odd number of ones in x.
        result |= 0x01; 
    }
    return results;
}